Heater



(NQ Model.)

J.v JOHNSON.

l HEATER. No. 274.785. Patented Mar. 27,1883.

u. Ferm; Phow'Limognpher, wnhingm. o c.

' UNITED STATES PATENT GEErcE.

JONATHAN JOHNSON, OF LOWELL, MASSACHUSETTS.

HEATEE.

SPECIFICATION forming part of Letters `Patent No. 274,785, dated March27, 1883.

Application led November 10,1882. (No model.)

To all whom t may concern:

-' the other.

'Be it known thatI, JONATHAN J oHNsoN, a citizen of the United States,residing at'Lowell, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inHeaters", of whichthe following is a specification.

My invention relates to that class of heaters in which radiators'aresupplied with steam or hot water from a furnace; and my inventionconsists in constructing the furnace, as fully described hereinafter, toreduce its cost and secure increased strength and efficiency.

In the drawings, Figure l is a sectional elevation of a portable heaterillustrating my improvements. Fig. 2 is a transverse section.

I have shown my invention in connection with a` portable heatingapparatus adapted to be sold as a completed article for application incars, dwellings, &c.; but the devices shown and hereinafter describedmaybe employed in 4what are known as stationary furnaces.

The base A is constructed in any suitable manner, as shown, and is ofcast metal divided by an annular partition, a, into an ash-chamber, w,and a combustion-chamber, y, which communicates with the flue.

The tire-pot bis contained within an outer casing, B, and Vsupports Orisbelow the generator or boiler C. The general form of the boiler is thatshown in the Letters Patent granted to me February 7, 1882; but thecasings D at the top and bottom, instead of being annular, as in saidboiler,.are segmental, or of such form that when the sections are puttogether they will constitute annular casings. Thus each l casing D, asshown, consists of two hollow segments, d d, connected byseries ofvertical pipes,

eto similar segments constituting the lower casing, D', the adjacentsegments being connected by short pipes or nipples t', so that water orsteam can circulate freely from one to An auxiliary connection may beeffected by bolts n, passing through lugs on the opposite segments, andthe segments of the upper easing may have lugsf, by which to suspend it.By thus forming the boiler of con uected sections I am enabled toreadily repair any part without replacing the whole, while the loss fromimperfect castin g is reduced, only such portion of a casing as isimperfect being discarded.

- outer casing of the furnace.

a downdraft. I therefore combine with the` It will be seen that thereare two series of vertical pipes c, one outsideof the other. This notonly affords additional heating-surface, but retains the gases longer incontact, preventing them from escaping before their heat is abstracted.v y

. InV the boiler described in the aforesaid patent the upowing gaseswere conhned by the This prevented casings and their tubes e acylinder,E, overlapping each casing and covering the tubes, so that the gases canpass between the tubes and cylinder, but cannot escape laterally beyondthe cylinder, but must pass outward at `the top, whence they can passdownward between the boiler and the outer body, B, to thecombustion-chamber y. By this means the gases, while hottest, areretained in contact with the boiler, where the greatest heat isrequired, and thence pass in contact with the cylinder B, which isheated. without being overheated, as was liable to be the caseheretofore.

To secureincreased strength for the outer cylinder, facilitate thebuilding of the heater, and the repairs thereof, I make the saidcylinder in two or more curved sections, each with vertical edgeflanges, g, which are bolted to the like flanges of the adjacentsection, forming vertical strengthening ribs and facilitating thebuilding and dsmemberment ot' the structure. The inlet and outlet pipescommunicating with the boiler pass through openings at the points ofseparation of the sections ot' the body B, so that the section can beremoved without detaching the pipes from the boiler.

With the parts constructed as set forth may be combined an air-heater,consisting of a second cylinder, B', preferably constructed like thecylinder VB, larger than and overlapping thelatter, to form anintermediate air-chamber, w, and extending above the top of the body B,and inclosiug an air-chamber, o, within which is situated a tank, F.

The tank F is in communication with-the upper casing, D, by a pipe, m,aud with the lower casing, D', by a pipe, n, which also communicateswith the water-inlet pipe p, and cold IOO airis admitted to the chamberw through an the boiler is always full and cannot burn out, while thesteam escapes through the pipe t.

' By this construction I secure the heating of a large volume of air foruse outside of the furnace, I maintainthe boiler full of water Withoutinterfering with the circulation, secure a convenient chamber for theseparation of the water and steam, so that no foam can enter thesteam-pipes, and yet maintain the compact character of the apparatus,especially desirable in portable heaters.

The apparatus is supplied with the usual gages, indicators, andregulators.

I claim- 1. The boiler consisting of casings D DQ, composed ot' separatehollow segments communieating by tubes, and vertical pipes e,substantially as set forth. t

2. The combination of the casings D D and pipes e, arranged inconcentric series, as specified.

3. The combination of the casings D D', pipes e, and cylinder E,substantially as set forth.

4. The combination of the boiler consisting 2 5 of cas-ings, tube andsurrounding cylinder, and the bod y-casin g B, and combustion-chamber y,communicating with the ue, as set forth.

5. The combination of the boiler, body B, separating tank F, surroundingair-casing B', 3o having air inlet and outlet, and pipes mn, extendingfrom said .tank to the upper and lower casin gs of the boiler,substantially as set forth.

6. The body-cylinder consisting of bent sections having edge tlanges, g,connected as set 3,5 forth, and inlet and exit pipes extending throughopenings formed in the lines of separation of said sections,substantially as set forth.

In testimony whereof I have signed my name 4o to this specification inIthe presence ot two subscribing Witnesses.

JONATHAN JOHNSON.

Witnesses:

J. N. MARSHALL, JOHN B. BROWN.

